What kind of tractor is it and where are you located? Of the 2 oils you list the 15-40 would be better cause it would make for easier starting in the cold and is the most common diesel oil. 10-30 or 5-30 diesel oil would be even better if it gets real cold. Older 2 stroke Detroit diesels are about the only ones that call for single grade oil. What does your manual recommend? I run 15-40 in the Kubota in my skid steer. The manual says 10-30 but that's mostly so they can say one oil works for everything, engine, hydraulics and chain case. I've never had a problem running the 15-40. I have to plug it in in the cold anyway. Dave
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